Instruction Manual - Magnetrol International

The level differential setting of the side mounting controls
can be field adjusted within limits specified in the table at
right by repositioning the jam nuts on the magnetic sleeve
stem.
NOTE: The control need not be removed from tank or vessel
to make differential adjustment.
6
CAUTION: Before attempting any work on the control,
be certain to pull disconnect switch or otherwise
assure that electrical circuit(s) through control is
deactivated. Close operating medium supply valve on
controls equipped with pneumatic switch mechanisms.
1. Disconnect wiring from supply side of switch mechanism
and electrical conduit or operating medium line connections
to switch housing.
2. Perform system shut-down as required to relieve pressure
from tank or vessel and drain off liquid “head”
above control mounting position. Allow unit to cool.
3. Remove switch housing assembly by loosening hex nut
located immediately below housing base.
With switch housing removed, jam nuts and magnetic
sleeve are now accessible, as in Figure 3. Raising the
lower jam nuts or lowering the upper jam nuts will reduce
the differential. Jam nut adjustments in opposite directions
will, of course, increase the differential. As the first step in
any adjustement procedure, the position of the lower jam
nuts (dimension A) should be established.
4. Loosen and remove upper jam nuts, guide washer and
magnetic sleeve. Dimension “A”, as measured from top
of stem to top of lower jam nuts, may now be increased
or decreased as desired.
Tandem model units have two switch mechanisms actuated
by two independent magnetic sleeves. For adjustment
purposes, each sleeve and jam nut set is considered as an
individual unit in conjunction with the switch mechanism it
operates.
NOTE: Be certain to tighten jam nuts securely after adjustment.
5. Replace magnetic sleeve on stem and position upper
jam nuts to desired “B” dimension by measuring from
top of sleeve to bottom of upper jam nuts. Lock upper
jam nuts to guide washer.
6. Reassemble control in reverse of steps 1 through 3, previously
described.
7. Test switch actuation by varying liquid level in tank or
vessel.
CAUTION: After increasing differential adjustment,
be certain to check carefully for proper operation of
switch mechanism. Magnet must “snap” cleanly with
additional float movement available after magnet
snaps.
LEVEL DIFFERENTIAL ADJUSTMENT
lower
jam nuts
magnetic
sleeve
magnetic
sleeve stem
Inches
guide washer
A B
Millimeters
pivot
float stem length
minus approx. 3 /4"
upper jam nuts
pivot
CL
Figure 3
high level
of control – differential –
low level
Differentials Obtainable ➁ ➃ Approx. Jam
Model ➀
Float Stem Length
203 305 457 660
Nut Setting ➂
A B
T62 Min. 32 51 73 102 21 0.8
(Threaded) Max. 148 206 294 409 33 27
T62 Min. 32 41 67 95 16 0.8
(Flanged) Max. 89 130 191 273 28 18
Differentials Obtainable ➁ ➃ Approx. Jam
Model ➀
Float Stem Length
8.00 12.00 18.00 26.00
Nut Setting ➂
A B
T62 Min. 1.25 2.00 2.88 4.00 0.81 0.03
(Threaded) Max. 5.81 8.12 11.56 16.12 1.31 1.06
T62 Min. 1.25 1.62 2.62 3.75 0.62 0.03
(Flanged) Max. 3.50 5.12 7.50 10.75 1.12 0.69
Notes:
➀ All models are factory set at minimum differential unless otherwise
specified.
➁ To maintain maximum differential, nozzle length "L" (Fig. 2) must
not exceed: 64 mm (2.50") model T62 threaded; or 89 mm (3.50")
model T62 flanged.
➂ Dimensions given are approximate and will vary slightly with each
unit.
➃ Consult factory for differentials of models not shown.
float